Create Items not allowed with Full Control

Note I Posted previously on my issue and am still having issues. This post by someone else has my exact same issue. Within a WF I am doing a Create Item. The Doc Library has Unique Permissions and the user has Full Control permission at the library level. The user also has Full Control permission at the Site level.

The user can manually create an item within the library no problem. However after he creates a new item in library A and the Workflow runs to create an item in libraryB he gets a workflow error..."could not creat list item..make sure the list exists and the user has permissions to add items to the list..."

I have the exact same permissions yet the workflow works fine for me...how is this possible..

Also, note we do not have the ability within Workflow settings to do an impersonation step via an Action Set.

Lastly in the create new item (Doc Library) within the workflow I do have a Document Type selected other than Document. The Content Type contains an Excel template. I see the Excel template is within the Forms path of the Doc Library. I assume since he has Full control access at the site level then this would be a non -issue in the event you need special type of permissioning for Content Types.. Really struggling on this one..

A quick thought, if the user has full control of the site, are the list inheriting from the site? If so then the user would have full control of both lists which is what you noted. However, the workflow would need permissions to operate on behalf of the user and I believe this setting called Workflow can use app permission at the site level would need to be set. Check for Site Settings > Manage Site Features.

My screenshot if from Office 365 but it should apply if you're on SharePoint

I have SharePoint Enterprise. The user has full control of the list, but note the list has unique permissions (not inherited). The user also has Full Control at the site level. I did try to activate the "Workflows can use app permissions", but I got the message "Sorry something went wrong"

If the list has unique permissions, be sure that the person generating the item via the workflow has at least create permissions on that list. Regardless of Full control on the site, the list will override that if permissions are changed. This allows SharePoint to manage item level control, even with a site owner having full control.

I'd bet that's where you're seeing the issue. Try inheriting and running a few test. If it resolves ypur issue. Figure out a different permissions method for the list.

When I go to the list and view permissions - permissions are unique and this individual has Permissions at "Full Control". Thus at the site level he has Full Control and and at the list level he has Full Control. The list currently does not inherit permissions, thus within the list I selected his name and the permissions of Full Control. Are you indicating this method will not work and I need to change the list to inherit permissions ?